> I've simplified things by removing the optional *s* argument everywhere,
> adding a parameter `current-random-source` initialized to SRFI 27's
> `default-random-source`, and a trivial bit of syntax (with-random-source
> source proc arg ...) that directly replaces any call that would use an
> explicit *s* argument.  That puts all the optionality at the right end
> in the usual way.

LGTM! Thank you.